Retractable blade knife



FIG. 1 is a perspective view of a retractable blade knife showing my newdesign;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front elevational view thereof, with the blade in apartially extended position; and,

FIG. 7 is a front elevational view thereof, with the blade in aretracted position.

The ornamental design for a retractable blade knife, as shown anddescribed.